Inventory Turnover & Days-on-Hand Calculator
Compute turnover ratio and days of inventory on hand from COGS and average stock — and see what your cash is doing.
Turnover = COGS ÷ average inventory; days on hand = 365 ÷ turnover. Higher turns = less cash tied up, but too high risks stockouts. Compare to YOUR industry — grocery turns 15+, heavy machinery 3-4.
Sources & references
- Inventory turnover / days-inventory-outstanding (financial analysis)
- Cash conversion cycle methodology
Inventory formulas use the model and inputs you provide — they are decision aids, not guarantees. EOQ, safety-stock and reorder math rest on assumptions (demand pattern, lead-time stability, cost accuracy) that rarely hold perfectly; treat results as a starting point and adjust to your data, service-level target and risk tolerance.
Inventory turnover is the single number that tells you how hard your stock is working: how many times a year you sell through and replace it. The math is COGS ÷ average inventory value, and its inverse-in-days — 365 ÷ turnover — is days inventory on hand, the more intuitive 'we hold about X days of stock'. This calculator gives both, plus inventory as a percentage of annual COGS, so the cash story is visible at a glance.
About Inventory Turnover & Days-on-Hand Calculator
Higher turnover generally means a healthier operation: less cash frozen in stock, lower holding costs, less obsolescence risk, and inventory that reflects current demand rather than last season's bets. But higher isn't unboundedly better — push turns too high and you're flirting with stockouts, lost sales and the firefighting cost of constant expediting. The right turnover is a balance, and crucially it's industry-specific: grocery and fast fashion turn 15+ times a year, electronics retail high single digits, heavy machinery or aerospace parts 3–4. Comparing your number to the wrong benchmark misleads completely. The real power is in the trend and the cash translation. Falling turnover (rising days-on-hand) is an early warning — demand softening, obsolete stock accumulating, or over-buying — often visible here before it shows up as a write-down. And the days-on-hand figure plugs directly into cash-conversion-cycle thinking: every day of inventory you cut frees the cash that day of stock consumed. Track turnover over time, segment it by product line (a healthy blended number can hide a dying category), and use it to challenge the inventory that 'we've always carried'. Pair with EOQ and safety-stock tools to act on what the turnover reveals.
How to use Inventory Turnover & Days-on-Hand Calculator
- 1Set each input — annual cogs, average inventory value — using your own figures.
- 2The estimate recomputes instantly as you type; no submit button, no waiting.
- 3Review the line-item breakdown to see how each component contributes to the total.
- 4Click “Copy quote” to paste the itemised result into an email, quote or audit note.
Why use Inventory Turnover & Days-on-Hand Calculator?
- ✓Itemised line-by-line breakdown, not just a single opaque total
- ✓Copy-ready output for emails, quotes and audit notes
- ✓Recomputes live as you type — compare scenarios in seconds
- ✓Free and private — nothing you enter leaves your browser
Frequently asked questions
How is inventory turnover calculated?+
Turnover ratio = annual cost of goods sold ÷ average inventory value (average of beginning and ending inventory over the period, or a multi-point average for accuracy). Use COGS, not revenue — revenue includes margin and inflates the ratio. Days inventory on hand = 365 ÷ turnover, telling you how many days of stock you carry on average. The two are the same fact in different units; days-on-hand is usually the more intuitive one to manage by.
What is a good inventory turnover ratio?+
Entirely industry-dependent — there's no universal good number. Grocery and perishables turn 15–50+ (they must, or product spoils); fast fashion and consumer electronics high single to low double digits; industrial and machinery 3–6; aerospace/spare parts lower still. Compare to YOUR industry's benchmark and your own trend, never to a generic target. A 'low' 4 turns is excellent for heavy equipment and alarming for fresh food.
Can inventory turnover be too high?+
Yes. Very high turns can signal under-stocking — frequent stockouts, lost sales, rushed expensive replenishment, and no buffer for demand spikes or supply disruption. It can also reflect hand-to-mouth buying that forfeits volume discounts. The goal is optimal, not maximal: enough turns to keep cash and obsolescence in check, enough stock to maintain service levels. If turnover rose but stockouts and expediting costs rose with it, the 'improvement' is costing more than it saves.
What does falling inventory turnover indicate?+
Usually a problem worth catching early: softening demand (sales slowing while stock stays), accumulating obsolete or slow-moving inventory, or over-buying relative to actual sell-through. Rising days-on-hand is often the first quantitative sign of inventory trouble before it becomes a write-down. Segment the decline — a falling blended ratio frequently hides one dying product line dragging down healthy ones. The fix follows the diagnosis: clear obsolete stock, tighten buying, or address the demand drop.
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